asset placement validation to use city location not players location

src/engine/net/client/handlers/PlaceAssetMsgHandler.java

@@ -190,7 +190,7 @@ public class PlaceAssetMsgHandler extends AbstractClientMsgHandler {
             return false;
         }
 
-        Realm serverRealm = RealmMap.getRealmAtLocation(player.getLoc());
+        Realm serverRealm = RealmMap.getRealmAtLocation(city.getLoc());
 
         // Cannot place buildings on seafloor or other restricted realms